The Burgess Shale formation in eastern British Columbia includes a wide variety of animal fossils such as Hallucingenia and Opabinia. When was the Burgess Shale formed?
a. about 8000 years ago
b. about 78 million years ago
c. about 505 million years ago
d. about 4 billion years ago
Ans: c. about 505 million years ago
You might also like to view...
A(n) __________ (fungus-root) is a symbiotic interaction between a fungus and a plant. Fill in the blank(s) with the appropriate word(s)
Some microbes gain access to the normally axenic central nervous system by
A) damaging the blood-brain barrier. B) axonal transport from infected peripheral neurons. C) infecting macrophages which subsequently enter the CNS. D) infecting lymph nodes in the cranium. E) either damaging the blood-brain barrier or by axonal transport from infected peripheral neurons.
Which of the following would you not find in the nasopharynx?
A. Haemophilus influenzae B. Neisseria meningitidis C. Branhamella catarrhalis D. Streptococcus pneumoniae
Which of the following does not belong?
a. phospholipids b. polysaccharides c. unsaturated fats d. steroids e. saturated fats